The police force in Jammu and Kashmir claimed on Thursday that terrorists involved in the Udhampur attack were backed by Pakistan's spy agency Inter-Services Intelligence (ISI).

Security forces during a terrorist attack on a convoy of Border Security Force (BSF) on the Jammu-Srinagar National Highway in Udhampur district of Jammu and Kashmir on Wednesday. (PTI Photo)

The police force in Jammu and Kashmir claimed on Thursday that terrorists involved in the Udhampur attack were backed by Pakistan's spy agency Inter-Services Intelligence (ISI).

"During the course of preliminary investigation, it transpired that the terrorists involved in the attack are trained 'fidayeens' and backed by Pakistan's ISI in order to wage war against the government of India," PTI quoted police sources as saying.

Police also mentioned the ISI angle in a preliminary report submitted to Udhampur district magistrate Shahid Iqbal Choudhary. Police said an FIR was registered under various sections of Ranbir Penal Code, Arms Act and Unlawful Activities Prevention Act.

A Pakistani militant was captured on Wednesday, only the second since the 2008 Mumbai terror attacks, shortly after he and an accomplice killed two BSF men and wounded nearly a dozen soldiers by ambushing a convoy on the Jammu-Srinagar national highway in Udhampur.

Police officers said the militant from Pakistan’s Faisalabad, identified as Mohammed Naved, had sneaked into Jammu and Kashmir about 12 days ago along with Noman alias Momin, who was killed in retaliatory fire by BSF personnel. The slain militant was from Bhawalpur in Pakistan.

ISI has intensified its attempts to push terrorists into India to carry out terror strike in hinterland, similar to last week's Gurdaspur attack, PTI quoted official sources as saying but did not name them.

Intelligence inputs suggested that a new strategy was hatched by ISI to expand the area of terror strike from Jammu and Kashmir and militants were being trained for the purpose, they said.

Home minister Rajnath Singh said in Lok Sabha on Thursday that there were five infiltration attempts from across the border in the last month. Four of them were foiled and eight militants were neutralised by the security forces .

On 27 July, three terrorists in army uniforms opened fire on a bus and then attacked the Dina Nagar police station in Gurdaspur district of Punjab.

The terrorists had sneaked into India from across the border taking advantage of an unfenced rivulet. Three civilians and four policemen, including a superintendent of police, were killed and 15 others were injured in the attack.

Asked about the route used by the Udhampur militants to cross over to J-K from Pakistan, Rakesh Sharma, inspector general of BSF (Jammu region), said: "Interrogation is being done by J-K Police. I cannot definitely say anything on that."

Replying to another question whether the attack was meant for Amarnath yatra convoy, he said: "It is matter of interrogation what was their intentions. One terrorist has been captured alive and I hope to get some facts out."

Sharma said that there was best possible security along the international border and it was not easy to cross over to the Indian.

On the question whether BSF was a target, he said it was chance and BSF was not main target of terrorists. "They were looking for a target and BSF convoy passed and it was targeted."